Patina Process -Color Changing with Age
Wood products can be dramatic in appearance, especially the exotics. Only factory made products such as tile, vinyl, wallpaper can have true uniformity of color
Keep in mind that wood is a natural product and that no two floor boards will be identical. Variations in appearance are completely normal and are to expected. As your floor ages, color change or "patina" can occur. This process can be rapid the first 3 months, less in 6 months, then finishing off in about I year.
Whether finished or unfinished, all wood changes color over time due to oxidation and when exposed to UV light. Some species darken in color over time, while others tend to lighten. There is no known set value for "color fastness" of a species, so contractors and or customers should be aware of this normal condition. Certain species, including American cherry, Koa, Brazilian cherry, and many imported species, have this tendency to change in color. Some color change is to be expected for all species and a drastic change can be expected for some. This "Patina" process although normal, can be minimized by limiting exposure to direct sunlight or accelerated by exposure. Periodically moving furniture and rugs will help to equalize overall exposure to UV light. If possible avoid completely covering floors with rugs for the first six months.
When installing, installers should select boards from several boxes. Working from one box at a time can create poor color grouping. Any extreme color difference can be selected or culled out and simply replaced with the 5-10% overage you should have on hand.